#79 lx200_classic over TCP link, Error in GetRA/DEC after slew

[GeneN]

lx200_classic INDI driver over a TCP link

For my setup it is failing in what seems to be subsequent to isSlewComplete

driver sends down the :D# command using tty_nread_section
Prior to receiving the whole response driver sends down :GR#

Now when tty_nread_section completes then isSlewComplete executes a
tcflush(fd, TCIOFLUSH);

This flush seems to be flushing out the response in the packet that also contains the response to :GR#

Example:
Send :D# wanting Y (Y=33) bytes returned
First response packet contains 8 bytes of response to :D#
Driver sends down :GR#
Second response packet to :D# contains 16 bytes
Third response packet contains remained of :D# response plus the response to :GR#
isSlewComplete flushes after seeing the Y bytes of the :D# so :GR# never sees its data?

The attached PCAP file shows the interchange

Also, for a classic lx200 the response length to :D# is 33 bytes versus the 8 as coded in lx200driver.cpp